This geographic data set contains boundaries of the areas with water supply service for most public water supply systems in New York State that serve over 500 people. Many systems with fewer than 500 persons are also included. Most Schools (Elementary, Middle, High) which are designated water systems are now included. This data set is under development so that polygons still show the larger legal service territory for many water suppliers, and therefore may not represent ground conditions. Users of the current version of this data set should use caution when inferring water service when boundaries of Water Supply Service are the same as the corresponding boundaries in Water Districts. https://gisservices.dec.ny.gov/arcgis/rest/services/der/der_viewer/MapServer/4?f=pjson